"It's always been there, I think. But lately, don't you feel...watched?"
The Castle is perhaps the most well-known anomalous entity in (world name). Its unnatural nature cannot be denied - the number of towers and spires seen from a distance seem to chance frequently, even in the time it takes to look away and back. When travelers approach, they often find themselves lost and turned around in the forest that surrounds it, never getting any closer.
But recently, the doors have opened...